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    • 1. 发明授权
    • Transmission mode detection in a modulated communication system
    • 调制通信系统中的传输模式检测
    • US5289476A
    • 1994-02-22
    • US698445
    • 1991-05-10
    • Howard W. JohnsonChin-Chen LeeAmy O. Hurlbut
    • Howard W. JohnsonChin-Chen LeeAmy O. Hurlbut
    • H04B3/54H04L1/00H04L27/00C06F11/10H03D3/22H04L27/20
    • H04L1/0039H04B3/542H04L1/0003H04L1/0025H04L1/0029H04L1/0072H04L27/0012H04B2203/5408H04B2203/5416H04B2203/5445H04B2203/5483H04L1/0057
    • A power line communication (PLC) apparatus wherein transmission mode information is encoded into each data packet while maintaining immunity from single bit errors. In the present invention, a power line communication system includes a transmitter/receiver (i.e. transceiver) which is coupled to a power distribution network. Data is transmitted through the power line by the transceiver in packets. The transceiver includes a preamble generator which creates a preamble for each of the data packets and a preamble decoder that decodes the preamble of a data packet and determines word sync for the packet. The preamble generated by the preamble generator consists of a carrier detect interval, a carrier sync interval, a bit sync interval, and a word sync pattern. The transceiver may select either BPSK or QPSK transmission modes on a data packet by data packet basis by encoding information into the packet preamble. Transmission mode information is encoded into the preamble using one of two seven-bit cross compatible word sync patterns for each data packet. Thus, one word sync pattern is used to define a BPSK transmission while the other word sync pattern is used to define a QPSK transmission. The transmitter may send data packets using either BPSK or QPSK on a packet by packet basis by generating the appropriate word sync pattern for each packet. The receiver uses the word sync pattern to determine the receive mode for each packet.
    • 一种电力线通信(PLC)装置,其中传输模式信息被编码到每个数据包中,同时保持对单个位错误的抵抗。 在本发明中,电力线通信系统包括耦合到配电网络的发射机/接收机(即,收发机)。 数据通过收发器在数据包中通过电力线传输。 收发器包括前导码生成器,其为每个数据分组创建前同步码,以及解码数据分组的前同步码并确定该分组的单词同步的前导解码器。 由前导码生成器产生的前导码由载波检测间隔,载波同步间隔,位同步间隔和字同步模式组成。 收发器可以通过数据分组来选择数据分组上的BPSK或QPSK传输模式,通过将信息编码到分组前同步码中。 使用针对每个数据分组的两个七位交叉兼容字同步模式之一将传输模式信息编码到前导码中。 因此,一个字同步模式用于定义BPSK传输,而另一个字同步模式用于定义QPSK传输。 发送器可以通过基于分组的方式使用BPSK或QPSK来发送数据分组,通过为每个分组生成适当的字同步模式。 接收机使用字同步模式来确定每个数据包的接收模式。
    • 5. 发明授权
    • Power line communication while avoiding determinable interference
harmonics
    • 电力线通信同时避免可测量的干扰谐波
    • US5404127A
    • 1995-04-04
    • US167431
    • 1993-12-13
    • Chin-Chen LeeHoward W. JohnsonPhilip H. Sutterlin
    • Chin-Chen LeeHoward W. JohnsonPhilip H. Sutterlin
    • H04B3/54H04L27/18H04M11/04
    • H04B3/542H04L27/18H04B2203/5416H04B2203/5425H04B2203/5445H04B2203/545H04B2203/5483H04B2203/5491
    • A power line communication (PLC) apparatus wherein a carrier is derived to avoid determinable interference harmonics. In order to transmit data on a power line containing the television interference or other determinable interference harmonics, the present invention uses redundant carriers at a frequency between the television interference harmonics. In the preferred embodiment, the first carrier is positioned at 118 KHz and the redundant carrier is positioned at 133.7 KHz for the PLC apparatus designed for use in the United States. Other carrier frequencies are used for other countries in order to avoid interference harmonics at a slightly different frequency. The present invention includes a waveshaping and modulation circuit for generating the modulated data waveform for output over the power line. In the preferred embodiment, the waveshaping and modulation circuit includes a waveshape ROM for storing samples that represent the appearance of the carrier waveshape. Once the appropriate waveshape is selected from the waveshape ROM, the 256 discrete points of the waveshape are clocked out an interface line to a DAC, a filter, an amplifier and on to a PLC coupling network for isolating and coupling the signal onto the power line. On the receive side, receive filters are used to separate the received data from determinable interference harmonics. These filters comprise four matched filters, two for each channel. These filters operate in cooperation with the waveshaping and modulation circuitry in order to capture the signals modulated between determinable interference harmonics such as television interference harmonics.
    • 一种电力线通信(PLC)装置,其中导出载波以避免可确定的干扰谐波。 为了在包含电视干扰或其他可确定的干扰谐波的电力线上发送数据,本发明以电视干扰谐波之间的频率使用冗余载波。 在优选实施例中,第一载体位于118KHz,冗余载体位于设计用于美国的PLC装置的133.7KHz。 其他载波频率用于其他国家,以便以稍微不同的频率避免干扰谐波。 本发明包括波形整形和调制电路,用于产生用于在电力线上输出的调制数据波形。 在优选实施例中,波形整形和调制电路包括用于存储表示载波波形的外观的样本的波形ROM。 一旦从波形ROM中选择了适当的波形,波形的256个离散点将时钟输出到DAC,滤波器,放大器的接口线,并连接到PLC耦合网络上,以将信号隔离并耦合到电源线 。 在接收侧,接收滤波器用于将接收的数据与可确定的干扰谐波分离。 这些滤波器包括四个匹配滤波器,每个通道两个。 这些滤波器与波形成形和调制电路协同操作,以便捕获在诸如电视干扰谐波之间的可确定的干扰谐波之间调制的信号。
    • 8. 发明授权
    • Switched-capacitor circuit analog-to-digital converter
    • 开关电容电路模数转换器
    • US4529965A
    • 1985-07-16
    • US491217
    • 1983-05-03
    • Chin-Chen Lee
    • Chin-Chen Lee
    • H03F3/34H03F1/30H03F3/70H03M1/00H03M1/40H03K13/02
    • H03F1/303H03M1/40
    • A switched-capacitor analog-to-digital converter implements a conversion scheme involving execution of an algorithmic technique of successive-approximation comprising a number of iterations dependent upon the conversion resolution desired. The algorithm used requires analog processing to produce an output voltage that is two times the output voltage resolved to realize the previous bit. The "times two" function is realized by adding the voltage of the last iteration to itself (i.e., V+V=2V). This is accomplished by storing the output voltage resolved into the previous bit and separately storing a voltage corresponding to that voltage. Both stored voltages are then transferred to an integrator circuit which adds the two voltages and produces the output voltage to be resolved into the next bit.
    • 开关电容器模数转换器实现涉及执行逐次逼近的算法技术的转换方案,其包括取决于所需转换分辨率的多次迭代。 所使用的算法需要模拟处理,以产生输出电压的两倍,该输出电压被分辨为实现前一位的输出电压的两倍。 通过将最后一次迭代的电压(即V + V = 2V)相加来实现“次”功能。 这通过将分辨的输出电压存储到前一位并分别存储与该电压相对应的电压来实现。 然后将两个存储的电压传送到积分器电路,该积分器电路将两个电压相加并产生要被分解为下一个位的输出电压。